Transfer RNA identity rules and conformation of the tyrosine tRNA-like domain of BMV RNA imply additional charging by histidine and valine.
This paper reports the first example of a triple aminoacylation specificity of a viral tRNA-like domain. These findings were based on structural studies on the brome mosaic virus (BMV) tRNA-like domain (Felden et al., 1994, J. Mol. Biol. 235, 508-531) together with knowledge on tRNA aminoacylation identity rules suggesting potential histidinylation and valylation capacities of the viral RNA in addition to its already known tyrosylation ability. Here, both predictions are demonstrated by in vitro aminoacylation assays. Kinetic parameters of histidinylation and valylation of BMV tRNA-like structure have been determined and compared to those of the corresponding tRNA transcripts and to the tyrosylation capacity of the molecule. The influence of experimental conditions on aminoacylation reactions was also studied. The novel aminoacylation capacities of BMV tRNA-like domain support its already reported three-dimensional fold and illustrate the predictive potential of modeling data. Biological necessity of specific or non specific aminoacylation will be discussed.
Felden
B
B
Institut de Biologie Moléculaire et Cellulaire du Centre National de la Recherche Scientifique, Strasbourg, France. bfelden@genetics.utah.edu
Florentz
C
C
Westhof
E
E
Giegé
R
R
D001483:Base Sequence; D017795:Bromovirus / Q000737:chemistry*; D007700:Kinetics; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D012331:RNA, Fungal / Q000737:chemistry; D012343:RNA, Transfer / Q000737:chemistry* / Q000378:metabolism; D012354:RNA, Transfer, His / Q000737:chemistry; D012365:RNA, Transfer, Tyr / Q000737:chemistry; D012366:RNA, Transfer, Val / Q000737:chemistry; D012367:RNA, Viral / Q000737:chemistry*; D013379:Substrate Specificity; D014158:Transcription, Genetic / Q000235:genetics
D012331:RNA, Fungal; D012354:RNA, Transfer, His; D012365:RNA, Transfer, Tyr; D012366:RNA, Transfer, Val; D012367:RNA, Viral; D012343:RNA, Transfer